Depending on your device, you may need to change your APN when returning home.
If you have an iPhone, you will need to delete the AOW profile from your APN settings prior to reinserting your carrier SIM card. For more instructions on removing the AOW profile from your iPhone click here.
For most other devices, you do not need to make any changes to your device's APN - it will automatically change when you reinsert your carrier SIM.
For information regarding APN settings for your home carrier, you will need to contact them directly, or visit their website.